ecology

6. extreme scarcity of food
7. the process of eroding or being eroded by wind, water, or other natural agents.
9. agricultural management systems carefully tailoring soil and crop management to fit the different conditions found in each field.
10. form of farming in which nearly all of the crops or livestock raised are used to maintain the farmer and the farmer's family, leaving little, if any, surplus for sale or trade
12. a bacterium, virus, or other microorganism that can cause disease.
14. he ability of a soil to sustain plant growth by providing essential plant nutrients and favorable chemical, physical, and biological characteristics as a habitat for plant growth
16. an increase in the total dissolved solids (TDS) of the aquifer caused by natural or anthropogenic factors
17. a destructive insect or other animal that attacks crops, food, livestock, etc.
18. pest control the use by humans of beneficial insects such as predators and parasitoids, or pathogens such as fungi and viruses, to control unwanted insects, weeds, or diseases

1. the capacity of bacteria to withstand the effects of a harmful chemical agent
2. The topmost layer of the soil that contains humus and living organisms in addition to the soil particles
3. a substance used for destroying insects or other organisms harmful to cultivated plants or to animals.
4. process by which fertile land becomes desert
5. lack of proper nutrition, caused by not having enough to eat
8. shortage of water.
11. agricultural technique for growing crops or pasture without disturbing the soil through tillage. No-till farming decreases the amount of soil erosion tillage
13. he total dry matter produced per plant or per unit area
15. used or suitable for growing crops.